Method of construction of bearer plates for use in presses and like machines



Se t. 2 1,643 893 p 7 1927 F. HUMPHRls vMETHOD OF CONSTRUCTION OF BEARER PLATES FOR USE IN PRESSES AND LlKE MACHINES Filed Nov. 8,. 1926 2 Sheets-Sheet 1 Am Y sept. 27, 1927.- 1,643,893

F. HUMPHRIS METHOD OF CONSTRUCTION OF RER PLA FOR USE IN PRESS AND KE MACHI Fi NOV. 8. 1925 2 Sheets-Sheet 2 Arm/vn in one or opposite plane faces thereof, which- Patented Sept. 27, 1927.

PATENT OFFICE..

FRANK HUMPHRQIS, OF PARKS'IONE, ENGLAND.

METHOD OF CONSTRUCTION OF BEARER PLATES FOR USE IN PRESSES AND LIKE MACHINES.

Application led November 8, 1926, Serial No. 147,148, and in Great Britain October 21, 1925.

This invention relates to a new or improved method of construction of bearerplates for use in presses and like machines to be used in substitution for the multigrooved kind of bearer-plate in one piece referred to in Patent Number 1,473,478, dated November 6, 1923, wherein bearerplates consisting of one piece are provided with two or more semi-circular grooves cut semi-circular grooves are, in one form, provided with liners. It has, however, been found both expensive and difficult to produce true grooves in such bearer-plates or so that each groove is absolutely like each other groove, particularly as they have to be semi-circular in cross-section and with the walls of any one groove parallel to the walls of any other groove and of the same depth. It is therefore evident that no correction of any machining error which may have occurred in the depth, parallelism or otherwise of the said semi-circular grooves can be made; and under these circumstances itis necessary to machine them to very fine limits and, in practice, it is often found that only one edge-pressure-plate of a set provided to coact therein takes all the load, whereas this load should be distributed over all the said edge-pressure-plates and all the said grooves in a bearer-plate. To overcome this difficulty and to provide accurately made bearer-plates which will eliminate the hereinbefore referred to disadvantages is the object of this invention.

This invention relates to bearer-plates or the equivalents therefor embodying any in-k dependent holder-plate or base which has one or more bearer-blocks secured thereon, all the parts of which are constructed in the manner hereinafter described. Each bearer-block made according to this invention must be provided with or have sunk in any face. thereof a so-called semi-circular groove of such absolute form that, when a true cylinder' of the correct diameter is placed therein, it will make contact with the whole of the surface of said groove, and any bearer-plate embodying this invention may include any number of these bearer-blocks attached to or mounted on an independent holder-plate or base in the manner hereinafter described. To ensure accuracy and to detect and reject faulty material during manufacture, the bearer-blocks are preferably produced in pairs, in one case from one piece of metal or material and in another case from two pieces of metal or material, preferably, but not necessarily, in the manner hereinafter described.

A method which in practice has proved themost satisfactory is to'bore or perforate a single or unit piece of metal or material and then, after rits-exterior faces are finished, to divide it into two bearer-blocks.

An alternative method is to make two bearer-blocks from two pieces of metal or material, previously faced so that they can be clamped together, and then bore them and finish their exterior faces.

The bearer-blocks are preferably secured to an independent holder-plate or base by means of screwed-members of known form or by screwed-members as shown in Figures l() and l1 of the drawings. In addition means are also provided whereby the bea-rerblocks can be adjustably clamped together between clampingbrackets or bars on the independent holder-plate or base at their correct pitch-distance apart.

The present invention is a radical departure from the methods usually employed in the known kinds of presses and like machines for the production of bearer-plates, and it will be obvious that various modiiications may be employed for the manufac# ture of bearer-plates embodying the chief lines of construction hereinafter referred to.v

In'order to give clear understanding, the

invention will now be described with ref-y erence to the accompanying drawings. It is to be understood however that the illustrations are merely given by way of example.

In these drawings Figure l is a front elevation of partof an independent holder-plate or base having a single row or set of bearer-blocks. l

AFigure 2 is a front elevation of part of an intermediate independent holder-plate having two rows or sets of bearer-blocks mounted thereon.

FigureB is a plan view of either Figure l or 2.

Figure 4 is a sectional elevation of the arrangement shown in Figure 1 on the dotted line 4 4, Figure 3.

Figure 5 is a sectional elevation of the arrangement shown in Figure 2 on the dotted line i-#1, Figure 3.

Figure 6 is a sectional elevation through one bearer-block and a clamping-bar and a holder-plate or base taken on a line passing through the airis of one of the clamping-screws of the kind shown in Figures 1, Q and 8.

Figure 7 is a cross-section of a bearerblock taken on the line 7 7, Figure 12 after the lues have been removed- Figulj@ 8 is a View, partly in section, showing a` bearer-block located in an independent holder-plate or base- Figure 9 is a View, partly in section, show-VV,

ing a bearer-block locate-don guides.

Figures 10 and 11 are views of studs hereinafter mentioned. c Y

Figure 12 is a perspective view of a bearerblock..

Figure 13 is a perspective view illustrating two finished bearer-blocks.

Figure 14 is a perspective View of a piece of metal for forming two bearer-blocks.

Like letters of reference refer to like parts throughout the drawings.

The chief components essential for carrying this invention into practical effect are the bearer-blocks e, and unless these are machined without error but, the grooves in each row or set are made parallel one to the other and ofthe same distance away from the. holder-plate c (Figure 1), or g (Figure 5), or the base CZ (Figure 8), on which the said grooved bearer-blocks a are mounted and secured, the resultant bearerplate would be useless as an interchangeable unit. It is therefore important that these bearerfblocks c should be machined -by a method and in a manner ensuring accuracy.

Vt'here one unit-piece of metal or material m .is used in making two bearer-blocks a, it is provided with a roamed or otherwise accurately formed hole ,n therethrough, as shown in Figure 14. But where two separate pieces of metal or material are used in making two bearer-blocks a, one of which is shown as ,nearly finisled in Figure 12,.'t-he said separate pieces of metal are each rstly provided with a plane contacting surface so that, when these contacting surfaces are placed'together, the two separate pieces of metal or material can be secured together with their contacting faces in close contact by any known `form of clamp, or by screws, bolts or the like, which engage orl extend through clamping-lugs or protuberances e (Figure 12), formed on the said separate pieces of metal or material, whilst they are being machined.

The clamping-lugs or protuberances e are formed on said pieces of metal or material to facilitate holding the two piecesA of metal or material during the machining thereof and are usually sawn off or otherwise re'- moved before the bearer-blocks a are mounted either on the holder-plates c (Figure i), or g (Figure 5), or on the base Z (Figs. 8 and 9).

Whether the bearer-blocks a are made in palrs from one piece of metal or material m, or from two separate pieces of metal or material clamped together, it is essential to forni a hole n, centrally therethrough, and it be important that this hole n is accurately bored or reamed or ground until it is both parallel and circular at which time it is ready to receive a cylinder or parallel mandrel or' spindle having a diameter identi- Cel. with that O the.. rounded bearing endsnv of'edge-pressurefplates which are to engage in the grooves made by forming the hole n. ,After the hole. n is finished the said cylinder or mandrel or spindle is inserted in it so as to enable the exterior faces of all the said bearer-blocks c, which must be parallel to the hole n, to be machined in a manner as to form such of the exterior-faces as are designed in contact with any other like eX- terior-faces of any other bearer-block a, or

the face of a holder-plate c (Figure 4) or g (Figure 5), or of a oase cl (Figures 8 and 9), with true plane surfaces which are parallel to the said hole a, and to the aXis of the mandrel or its equivalent on which the bearer-blocks a are machined. The bearerblocks a are also machined so that two of their plane surfaces which may contact with other bearer-blocks a, are at right angles to the plane-surface on the bottom thereof which contacts with a holder-plate c or g, or a base rl. After this machining has been done the mandrel or its equivalent is removed and, in the case where one perforated piece of metal m is used, such piece is sawn through or otherwise divided along the line as shown in Figure 14 so as to produce two bearer-blocks e therefrom, and these bearer blocks a, after the metal or material has been removed as the result of sawing or cutting through, each has an almost semicircular groove b. These grooves would lhe kof-c mplete semi-circular form incr-osssection if it were possible to divide the said.

one perforated piece of metal mV as shown in Figure 1&1 of the drawings without removing any metal in so doing. y

lhere two separate pieces of metal or material are clamped together and-bored so.

that one-half of the perforation is cut into each piece of metal, as shown in Figure 13, the said two pieces 0f metal or material can then-be clamped on to a mandrel or its equivalent and machined on their exteriorfaces in a like manner to that hereinbefore described in connection with the one perforated piece of metal m. lt is then only necessary to remove the means employed for clamping the said two separate pieces of lli() lll) metal or material together' in order yto obtain two bearer-blocks a, each having a complet-e semi-circular groove Z; in cross section. It is obvious-that one bearer-block could be machined in the manner hereinbefore referred to by clamping it on the mandrel, cylinder or spindle and this is intended ,to be included in the spirit Aof this invention.

The exterior-faces ofthe bearer-blocks c of any set which contact with a holder-plate c or g, or a base d, when machined in the manner hereinbefore referred to, are the same distance away from the axis of the mandrel, cylinder or spindle upon which they were machined. The exterior-faces of the same set of bearer-blocks a, which are to contact one with the other are also machined in order that they vmay be at such definite distances away from and parallel to the axis of the mandrel, cylinder or spindle on which they were machined that, when they are mounted side by side in any number, or as a set, the grooves Z) thereof are then parallel one to the other and at an absolute pitch-distance apart.

Thatever combination of parts is employed to serve as a bearer-plate it is essential that the bearer-blocks a therefor are produced accurately; and to do this the said 1 bearer-blocks a are preferably made in pairs,

at one and the same time, so that their exterior-faces which may contact with other members of the bearer-plate can be finished whilst the said blocks c are mounted on the said mandrel, cylinder or the like, such as any machine spindle capable of being einployed for the purpose.

Bearer-blocks a made according to this invention may be mounted on any suitably formed cylinder, mandrel or machine spindie or the like which is preferably provided with a collar and/or a locating-pin which serves to enter a recess or the equivalent in one of the unfinished bearer-blocks or, vice versa, means may be employed-to prevent independent movement on the said spindle or the like, and this spindle may also be provided with any known form of screwthreaded clamping means; or, alternatively, two spindles or the like mounted in two headstocks or the like of known form may be employed during the machining of the exterior-faces of the unfinished bearerblocks. The latter method is advantageous particularly where the length of the finished bearer-blocks c exceeds twice the diameter of the finished perforation n in the one piece of metal m, or in the two separate pieces of nietal or material from which the said bearer-blocks a are made.

` Bearer-plates of any ydesired length and employing either any desired number of bearer-blocks can be made according to this invention.

By placing bearer-blocks a, formed as described, side by side, they may be bolted together in any known manner and thus form a bearer-plate without theV use of a holderplate c, or g, or a base 6l, but it is not advisable to dispense with a holder-plate such as c or g, or a base d, except when employed to take very light loads. Therefore, when two or more bearer-blocks a arranged side by side, or face to face, or end to end are employedv to .form a bearer-plate, they are preferably held in or on an independent holder-plate such as c (Figure 4) or g (Figure 5). Alternatively the bearer blocks a may be held andr secured directly upon a base, table, ram or other suitable part l of the machine in which they are incorporated, and the said bearer-blocks c are held in their correct position on the holder-plates c or g, or base or other parts Z of the machine in which they are used, by means of screws, bolts or the like of the known kind, or by studs it (Figure 6) or (Figure 5), and/or by clamping-brackets or bars /c (Figure 6), or by other known means secured to the said holder-platesl c or g, or the base or other part d of the machine by means such as scre\ It" (Figure 6).

The said clamping-brackets or bars l@ are provided with clamping screws Z, and these serve lo force tlie'contacting faces of the bearer-blocks a, tightly together; and locknuts u are provided to keep the clampingscrews Z in position.

There an intermediate and independent holder-plate g is used, it is provided on its opposite faces with two plane surfaces on which the bearer-blocks cc are vmounted and secured as shown in Figures 2 and 5.

To permit the said bearer-blocks a to serve as journal bearings in addition to `serving as bearer-blocks, caps or journal covers of the known kind may be provided and secured to the bearer-blocks c by means of screws, bolts or the like in any known manner.

The holder-plates c or g, may be provided in each case with a locating-groove c', as shown in Figure 8, or they may be provided with locating-guides CZ to accommodate channels or grooves d formed in the bottom of the bearer-blocks a, as shown in Figure 9, and the said bearer-blocks o may be provided on their ends with lugs through which bolts or screws may extend to secure the said blocks a toI either the holder-plate c or g, or to the base CZ, as shown in Figures 8 and 9.

In producing the known form of multigrooved bearer-plates in one piece not only is there considerable difiiculty and expense in maintaining the convex cutters for so doing in a workable condition, but the presence of blow holes in the metal makes italso necessary to reject a large proportion of multigrooved bearer-plates during the making lll) lUt)

thereof7 often through defects Which develop only when the linal machining of one oi the last grooves is being done.

lWhere the bearer-blocks of this invention are employed as components lor use in forming bearer-plates, any detects therein usually appear during the rough boring thereot and betere any expensive linishing Work has begun and any detective blocks can be rejected. Therefore, an accurate and reliable bearer-plate embodying bearerblocks madeaccording to this invention can be y1nanuact-nred n'iore"cheaply than'can multisgrooved bearer-plates of the known kind.

By employing bearer-blocks a, and mounted on holder-plates c or g, o; on a base or the like d, in substitution 'for multi- .grooved bearer-plates oi the known kind7 it is possible to dispense with the costly and inaccurate method oi cutting grooves in bearer-plates by means of convex cutters, Which convex cutters on account of the continual Wear and the chipping ot .their cutting edges often cannot maintain a constant and original cnrvature for a period sutil cient to accurately form a single groove, in ordinary commercial cast metal or in other material such as Wood libre or the like. The present invention has been devised to avoid this and to also avoid detects likely to occur in practice during Ythe manufacture of bearer plates of the known kind.

I claim l. A bearer-plate comprising a base plate and grooved bearer-blocks arranged side by side on the base plate and removably attached thereto.

and having the grooves therein formed by boring and rea'ming a cylindrical hole in a pair of blocks.andseparating theblecks..

3.y Anbearer-plate comprising#zi-base plate, grcoved bearer kblocks having grooves formed therein by boring and roaming a cylindrical hole iny a pair or' blocks, machined exterior surfaces on the VblocksV in''trnefparallelism with the axis o' the hole and means orsep'- arately attaching each biock to the base plate.

Il. A bearer-plate comprising a base plate, grooved bearer blocks arranged side by side on the base plate7 and means .for securing the said blocks against displacement on .the base plate in a direction transverse to the grooves. Y l

5. A bearer-plate comprising a base plate and interchangeable parallel-Walled bearer blocks arranged closely side b y side on the base plate andhaving longitudinal grooves cylindrical form therein, the axes of the ooves lie-ing parallel to the planes of the s des oliI the blocks.

6. A bearer-plate comprising a base plate, grooved bearer blocks mounted on thel said plate and means for retaining said blocks against endwise movement on the plate.

FRANK HUMPHRI-s. 

